From TekWiki
Jump to navigation Jump to search
Tektronix 7B81P
Programmable Timebase
Tektronix 7B81P Timebase plug-in

Compatible with 7000-series scopes

Produced from (?) to (?)

  • please add
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix 7B81P is a programmable time base plug-in for 7000-series scopes that was probably designed in 1975.

It is composed of a digital board, a trigger board, and a sweep board. On the digital board, there is a Motorola 6800 microprocessor and six 6820 Peripheral Interface Adapter ICs to provide more I/O pins. On the trigger board, there is a 155-0126-00, a 155-0109-00, two AD7511 analog switch ICs, an MC1408 DAC, a CD4053 analog switch, and a couple of opamps.

The sweep board is mostly discrete and makes use of Tek-made timebase capacitors.

Key Specifications

  • please add


Custom ICs used in the 7B81P

Page Model Part nos Description Designers Used in
155-0109-00 M120B 155-0109-00 155-0109-01 trigger Gary Vance 5B25N 5B31 5B40 5B42 5B44 5S14N 7B50A 7B53A 7B80 7B85 7B87 7B81P 7B90P 7S14 7612D SC502 SC503 SC504
155-0126-00 M121 155-0126-00 trigger source selector and P-P auto amplifier Art Metz 7B50A 7B80 7B85 7B87 7B81P 7B90P